Most voted "image-processing" questions
Image processing is the application of a set of techniques and algorithms to a digital image to analyze, enhance or optimize image features such as sharpness and contrast.
Learn more…126 questions
Sort by count of
-
87
votes2
answers4860
viewsAlgorithm to detect nudity with good accuracy
I was researching some libraries in Python that could detect nudity in photos, so that somehow I could avoid inappropriate content on my site. Then I found the library nudity. The problem is that,…
-
41
votes2
answers1150
viewsHow to count the objects present in the image with PHP?
The original photo of the bean is this: It lowers the resolution of the photo, I’ve already applied a grey-scale filter and increased the contrast to maximum to turn black and white. Then I examined…
-
23
votes1
answer975
viewsWhat is an SVG?
Nowadays, we talk about image quality and always linked to this type of statement every now and again, this mysterious acronym appears. It seems to be SVG something really amazing, they say that…
-
17
votes3
answers2390
viewsFind the center of each circle in the image
I have this image and wanted to catch the x and y of the center of each circle. I have tried several ways, but in none have I succeeded. My question is if there is any java lib to do this or any…
-
14
votes1
answer2902
viewsHow does google’s "Search for similar image" feature work?
I need to create a manager for a very large image bank, where in this manager besides the search for title and description, there should be a resource that searches for visually similar images. For…
-
12
votes2
answers4725
viewsImage rotation in java
I need an algorithm to rotate an image in java. On the Internet I found a promising algorithm at this link, and I tidied it up and adapted it to use angles in degrees. It was like this: public…
-
11
votes1
answer1015
viewsCalculations used to rotate an image on canvas
I have the following code below to be able to rotate an image through the canvas. function qs(selector) { return document.querySelector(selector); } function rotacionar(canvas, image, angle) {…
javascript mathematics canvas image-processing rotationasked 8 years, 6 months ago Wallace Maxters 102,340 -
8
votes3
answers1531
viewsHow to identify heat regions in thermal images?
I’m developing a project where I need to process photos taken from a thermal camera. The idea is to try to identify fires in these images. I would like to know what techniques I can use for such a…
-
8
votes1
answer159
viewsHow does logic work to figure out the size of the image?
In PHP and other programming languages, it is possible, through some special functions, to discover the image size. For example: list($width, $height) = getimagesize('images/icon.png'); I was…
-
8
votes1
answer380
viewsHow to remove the background of an image using Watershed on android?
I’m developing an app that classifies images of wounds. For this, I need to highlight the region of interest of the background to facilitate the work of the classification algorithm. The user uses…
-
7
votes2
answers2411
viewsCount how many pixels of a color the image has
I am working on a solution for tattoo studios. I would like to know how it would be possible to determine how many pixels a certain color exists in the image inserted in pictureBox1. In this image,…
-
7
votes1
answer2289
viewsHow to remove image noises using opencv - python?
I am working with skin images, in the recognition of skin spots, and due to the presence of noises, mainly by the presence of hair, it is more complicated this work. I have an example image in which…
-
7
votes1
answer513
viewsHow to remove noises and hairy image lines?
I’m working on hair removal on skin images. Researching the literature, the means to achieve my goal, applying some techniques of segmentation and removal of noise in images. Which I’m applying to.…
-
7
votes2
answers602
viewsError splitting image in half using Python
I’m trying to split an image in half using the code below, but I’m having a feedback error. Code: import cv2 import numpy as np # Read the image img = cv2.imread("IMD015.png") width = img.shape #…
-
6
votes1
answer2824
viewsHow to measure area and diameter of flat uneven scanned image (not 3D) using java?
I’m from the health area and never took a course in Programming Language, but for some reasons I will need to make a software to help in my research. I need to measure the total area and also area/3…
-
6
votes2
answers532
viewsAdvanced image optimization and compression on web servers without using external services
How to do even more optimized compression than you can achieve with tools like ImageMagick and libgd (GD) without generating WEBP image? Some services such as https://tinypng.com/ and…
image optimizing unix image-compression image-processingasked 10 years, 4 months ago Emerson Rocha 3,710 -
6
votes1
answer1544
viewsHow to get the predominant color in an image?
I’m taking a picture of a camera and passing it to a ImagemView and would like to take the predominant color of this image, how could do this on Android? my next classLaiout ( wrote laiout with i…
-
6
votes1
answer942
viewsRemove noise, dots and image strokes
I would like to know how I can process a captcha image to remove noise, strokes and dots. Here are examples of how you are and how I’d like you to stay. Original Image: Adjusted Image:…
-
6
votes0
answers178
viewsHow to detect and read text in an image?
I intend to develop an application through which an image submitted by the user should be processed and its text blocks detected and read. How should I do it?
image-processingasked 9 years, 2 months ago Rodrigo Rigotti 12,139 -
6
votes2
answers1906
viewsConvert and save photo in BD
I am working on a project where I have to save some photos. So I am studying the best way to accomplish the task. I thought about saving in the database, because these photos will be accessed both…
sql-server asp.net-mvc-5 winforms image-processingasked 8 years, 5 months ago Thomas Erich Pimentel 3,059 -
5
votes1
answer1306
viewsIdentify objects in an image with javascript/php
Is it possible to identify objects in a given image with Javascript or PHP? Facial recognition I know has how, and how would other objects?
-
5
votes2
answers818
viewsPixel distribution algorithm
Well, lately I’ve been thinking about algorithms to create random maps/ images and I came up with a question that I’m going to post here for you to clarify. Suppose I have green and yellow pixels.…
-
5
votes0
answers108
viewsUse camera to measure body part height
I’m designing an app that will measure body parts to see which accessory fits best. I wonder if the camera of a Smartphone has this capability and how to instantiate it in the project
-
5
votes1
answer563
viewsJavascript Image Handler
Is there any image handler similar to canvas or jimp for node.js? Explanation of why you don’t want to use either: So I was trying to use canvas as a test, and it’s taking too long to compile the…
-
5
votes1
answer992
viewsImage segmentation with Canny Edge Opencv
I’m trying to target the edge of both the iris and the pupil using Canny Edge from Opencv. However all the parameters I used do not meet the criterion of leaving well delimited the two edges. The…
-
5
votes1
answer247
viewsRemove eye shine on image
Well, I’m trying to apply Canny edge to the image but the brightness that is contained in the pupil hinders the result because to have an edge with cv2.Canny() or feature.canny() needs there to be a…
-
4
votes1
answer1040
viewsImage recognition within a larger image
I would like to do a part of my application, where the user would upload an image full of drawings inside, he would then select an area of the image and I would search the entire image uppada,…
-
4
votes1
answer114
viewsarray 1D for Bitmap
I’ve been working on an FPGA project that sends an array (1D) of Bytes from a grayscale image to the PC. Well, I wrote a simple code with some image to simulate sending and receiving an array and…
-
4
votes1
answer758
viewsidentify basic geometric shapes in image
I have to identify and catalog geometric profiles. as in the following images: The images will always be scanned in black and white, and at full size. and will always be composed of geometric forms,…
image-processingasked 9 years, 3 months ago filipe vieira 41 -
4
votes1
answer372
viewsWhat formats are used to represent values (color, contrast, brightness) in digital images?
What I want to do is: recognize pixel patterns in a file, or know how Assembler treats it (to make it easier to recognize these patterns). Always wanted to create some application to manipulate…
-
4
votes2
answers5448
viewsIs it possible to mirror an image horizontally (flip) with Canvas?
I know it’s possible to mirror horizontally <img> with CSS, but wanted to know if it is possible to mirror an image horizontally inside a canvas. With CSS, I would do like this: #img-flip{…
-
4
votes1
answer1206
viewsHow to remove area of interest from the background of an image?
I am starting to work with image processing in pattern recognition, and I need to do pre-processing of the images I will use. First, I need to highlight the region of interest from the background of…
-
4
votes1
answer1677
viewsCalculate percentage of certain colors in an image
I have a program that reads an image and checks if there are certain colors in that image, if it does paint each pixel a certain color. I couldn’t find materials on the Internet that could help me,…
python-3.x opencv image-processing histogramasked 6 years, 9 months ago Marcos Paulo S. Rezende 351 -
3
votes1
answer390
viewsCalculate percentage of a face in an image
How would the calculation of porcetangem of a face in an image? Suppose I had a 3x4 photo of a user, but he had a lot of his hair covering his face. Is there any way to detect that the image does…
-
3
votes0
answers98
viewsInvalid icc profile: Duplicate Sequence Numbers
By calling ImageIO.read from the attached image, error occurs Invalid icc profile: Duplicate Sequence Numbers. Very simple code just doing: File file = new File("C:\\temp\\imagem_java_teste.jpg");…
-
3
votes1
answer1209
viewsIs there any object recognition framework for Android?
I wonder if you have knowledge and if there is a framework for recognizing objects, people, anyway, things, ready to be used on Android. It’s similar to the idea of the app Google Goggles and the…
-
3
votes1
answer3056
viewsImage editing using Opencv with no ready-made functions
I have the following picture shown below and I need to turn it into gray and then binarize it. I use the following code to show it on the screen cv::Mat img = cv::imread("lena.jpg");// Lê a imagem…
-
3
votes1
answer2127
viewsHow to create image thumbnails of an existing image within the folder?
I’m learning to program, including learning VERY MUCH with the help of you who teach me practically everything about functions and my problem now is this: I need to create thumbnails of several…
-
3
votes3
answers654
viewsHow to loop inside an image folder and resize them?
I have this class in PHP that when running resizes the images contained in a folder. If you observe, the resizing is triggered by these instructions, one for each desired size.…
-
3
votes1
answer1432
viewsImage processing help (background removal)
I need to create a code to perform the frame processing of a video. In case the program will scan the pixels of the image and analyze the colors of the pixels and if you find colors close to the…
-
3
votes1
answer177
viewsPlace objects on image
I wonder how could do to place objects on an image on Android. An example would be to have the photo and on it put other images like circles, triangles etc... How could do this on android?…
-
3
votes1
answer165
viewsIs there any way to manipulate the brightness of the image through Canvas?
I am developing a system where the user can make small adjustments in images, and can rotate and cut currently. Before this whole part was being done through coordinates, where I sent the parameters…
-
3
votes1
answer1631
viewsHow to delete components from an image using python?
I’m a beginner in python and would like to know how to eliminate components (red, blue or green) of an image using python, I downloaded some image processing libraries (like opencv). I wonder if…
-
3
votes1
answer3048
viewsRotate PPM image by 90 degrees in C
Well, I’m trying to spin 90° an image in PPM Nxm format in C language and I’m not finding a way to do that. The program reads the image of an external file and ends up creating another, both in PPM…
-
3
votes1
answer56
viewsGenerate new centered image at one point
I did a processing and found a point in the image that meets my criteria. I need to cut the original image into a smaller one (120x120) that has that center point. I tried to do the following: img =…
-
3
votes1
answer87
viewsDepth in some opencv methods
What is the parameter depth that appears in many opencv functions? For example from filter2D(), what I understood by what ta in the documentation would be the number of bits to represent the…
-
3
votes1
answer4136
viewsHow to convert color image to black and white and highlight only the white of a video
I would like to highlight the white color using webcam and opencv python, however my image is colored, first I need to convert to black and white and then I would like to highlight only white, which…
-
3
votes0
answers97
viewsDoubt provided to the calculation of the area
I was testing an algorithm that returns to me the area of objects based on a reference, a priori this gave me results quite close to the real, when the reference was the same height of the measured…
-
3
votes1
answer1032
viewsHow to rotate an image without knowing the angle of inclination?
My program receives an image of a scanned CNH (with background paper). The goal is to remove the background and leave only the CNH. When the document is upright, there is no problem, since I can use…
-
3
votes1
answer1434
viewsHow to compare two shades of color and give the percentage of similarity (Java)?
How to take images with the same dimensions (images of two equal squares) and analyze their tones to tell how similar they are (return a percentage of the similarity between the two tones of the…